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Online Journal of Veterinary Research©
(Including Medical and Laboratory Research)
Volume 25 (11):822-831, 2021.
Reference electrocardiography for sheep and goats by age, gender and pregnancy
Mirabad MM1, Rezakhani A2
1Faculty of Veterinary Medicine, Department of Large Animal Internal Medicine, Tehran University, Tehran, 2 Faculty of Veterinary Medicine, Deparment of Large Animal Internal Medicine, Shiraz University, Shiraz, Iran. Corresponding author: firstname.lastname@example.org
Mirabad MM, Rezakhani A., Reference electrocardiography for sheep and goats by age, gender and pregnancy, Onl J Vet Res., 25 (11):822-831, 2021. We report reference electrocardiography by gender, age and pregnancy in 192 sheep and 192 goats by base apex bipolar limb lead record of ~2 minutes. In sheep we found highly significant (P < 0.001) gender based ECG differences with males recording lower P-R (-9%), Q-T (-17%) and R-R intervals (-20%). Concerning age, we found lower QRS amplitude (-13%) higher P-R (13%), Q-T (17%) and R-R intervals 27% in older sheep and T wave was 12% shorter (P < 0.001) in non-pregnant ewes. Age and P wave amplitude were negatively correlated (P < 0.026) but positively related with duration (P < 0.034) of P-R, Q-T, R-R intervals (P < 0.001) and heart beats with P-R, Q-T and R-R intervals (P < 0.001). In goats we found similar results to sheep but lower differences with gender P-R, Q-T and R-R intervals (2 -7%) (P < 0.001). However, older goats had much higher P duration (18%) P-R (17%) Q-T 13% T amplitude (17%), R-R intervals (27%) and QRS amplitudes (18%)(P < 0.002). Again age correlated with P-R, Q-T and R-R intervals (P < 0.001) but negatively with QRS wave amplitude p<0.001) and heart rate with P-R, Q-T and R-R intervals (P < 0.001). We found no effect of pregnancy on any parameter in goats. We find base apex lead system is suitable for ECG in sheep and goats.
Key words: electrocardiogram, parameter, age, sex, sheep, goats.